Alloy



Patented Mar. 20), I923.

UNITED stares arissa PATENT @FFHCE.

CHARLES PACK, OF NEW YORK, N. Y., ASSIGNOR T DOEHLER DIE CASTINGCOMPANY,

01* BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

ALLOY.

Alloys, of which the following is a specification.

This invention relates to alloys and in particular to aluminum alloyssuitable for die casting. r I

In making die castings, an alloy is re quired that has a maximumstrength and elongation at high temperatures, since otherwise thecastings are apt to be cracked. It is also essential for a good diecasting alloy that it lay to the surface of the die, since otherwise thecasting is apt to show blow holes and surface imperfections. Another vessential for a good die casting alloy is that it does not solder oradhereto the surface I of the die.

The object of my invention is to provide an improved aluminum alloy forthe purpose above stated. Other objects include the provision of analuminum alloy of such a character that die castings made therefrom arenot apt to contain cracks or blow holes or surface imperfections, andonewhich will not adhere to the surface of the die.

In accordance with my invention, I forman alloy of a predominatingproportion of aluminum and relatively small proportions of nickel,copper and silicon. I have found 5 that these metals can thus becombined to form an alloy which, when die cast, will lay to the surface.of the die without sols.

Application filed October 10, 1921. Serial No. 506,932..

dering or adhering thereto, and which has sufiicient strength andelongation at high temperatures, so that die castings made therefromwill not contain cracks, or blow holes or surface imperfections.

I havefound that alloys'of nickel, copper, silicon and aluminum withinsubstantially the following proportionshave the qualities abovereferred'to: A

An aluminum alloy covered by the above table has a tensile strength ofapproximately 30,000 pounds and an elongation of approximately 8%, andwill produce castings which are 'free from surface imperfections andcracks.

What I claim is 1. An alloy consisting of not less than 85% of aluminumand smaller proportions and over 1% of nickel, copper and silicon.

2. An alloy consisting'of a predominating proportionof aluminum, nickel3 to 6%, copper 3 to 6%, and silicon 1.5 to 4%.

3. An alloy consisting of nickel 3 to 6%, copper 3 to 6%, silicon 1.5 to4%, and aluminum not less than 85%.

This specification signed and witnessed this 7th day of @ctober, 1921.

CHARLES PACK.

Witnesses;

WILLIAM R. AHRBEIRG, WILLIAM E. BAUERsoHMID'r;

